So, in ancient Greece they had slaves to do all the undesirable jobs:
Dr. R.S. Barendse writes:
"...of course, the Athenians had slaves to do boring and heavy
work..."
In the Soviet Union jobs were assigned:
Georgi M. Derluguian writes:
"My grandpa was saved in 1930 when he refused to become the collective
farm accountant (he had 7 classes of education, a lot). The local OGPU
simply deported the entire family to the Kalmyk desert to work at the
railway construction. They ate prarie dogs and occasionally dried
camel meat there, which actually saved the family."
This is I think one of the "great fears" of a communist system. Yes,
freedom to chose one's vocation in the current system is greatly
limited, but the alternatives posited above don't even allow for the
ability to dream. Even if there were no "human nature" what is
important is that average people believe there is, and part of the
belief is that people will take advantage of a system where they can.
In this context the notion of a system where everyone cooperates due
to enlightened cooperation will not fly with the average person.
In the alternative to the current world system what will be done if
someone decides they are not going to do the shit work, nor are
willing to be assigned their vocation?